UnScramble this Word: r a o t e b b a?

Questions

In 1878, Wanamaker's of Philadelphia was the first U.S. department store to install?

In 1900, there were _______ cars in the United States?

By 1919, there were _________ cars in the U.S?

The little "m's" on "M&M's"(r) Chocolate Candies weren't printed on the candies until ____?

The maximum flight speed of a Boeing 747-300 jetliner is __________ miles per hour?